242001551521 has 2 divisors, whose sum is σ = 242001551522. Its totient is φ = 242001551520.

The previous prime is 242001551509. The next prime is 242001551557. The reversal of 242001551521 is 125155100242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199394399296 + 42607152225 = 446536^2 + 206415^2 .

It is a cyclic number.

It is not a de Polignac number, because 242001551521 - 2⁹ = 242001551009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242001551521.

It is not a weakly prime, because it can be changed into another prime (242001551591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121000775760 + 121000775761.

It is an arithmetic number, because the mean of its divisors is an integer number (121000775761).

Almost surely, 2^242001551521 is an apocalyptic number.

It is an amenable number.

242001551521 is a deficient number, since it is larger than the sum of its proper divisors (1).

242001551521 is an equidigital number, since it uses as much as digits as its factorization.

242001551521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 242001551521 its reverse (125155100242), we get a palindrome (367156651763).

The spelling of 242001551521 in words is "two hundred forty-two billion, one million, five hundred fifty-one thousand, five hundred twenty-one".